I dunno about absolute instantaneously getting there. But if I could snap my fingers and just slowly fatten up to say 750lbs, gaining about 10-20lbs an hour, I'd do it.
A little of both. I love logging onto this site with a huge plate of food in front of me and stuffing myself while reading the forum, chatting and watching pictures. Then weighing myself and taking pictures realizing how much how much I already gained and how big I have become and much it turns me on.